Swansea face an anxious wait to discover the extent of the ankle injury which forced Michu off during their goalless draw at Reading.
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The early indications from Swansea's medics were that Michu had not suffered ligament damage, but the Spaniard left the Madejski Stadium with his ankle heavily strapped.
Michu is the joint top scorer in the Premier League with 13 goals and is now very doubtful to play against Fulham at Craven Cottage on Saturday.
Swans manager Michael Laudrup said: "His ankle is twice as big now. We don't know how bad it is.
"The doctors and the physios say it shouldn't be the ligaments, which is the most important thing.
"The next question is 'will he play on Saturday?' I don't know. We will have to wait 24 hours.
"Hopefully it is not too bad. It is not a muscle injury but still we have to be careful. He has to be 100 per cent.
"He is one of the top scorers in the league, definitely our top scorer. He has played nearly every match this season.
"Even if he is the most important player, we have to deal with it (if he is out). If you rely so much on one or two players it is not good for any team."
Michu limped out of the action after poking a close-range effort over the bar and curling a long range effort just wide as Swansea were frustrated by Reading.
Laudrup's men dominated the first half but in the end were left clinging on for the points, with Chico Flores heading Adam Le Fondre's volley over the bar.
"I am satisfied with the performance, not so much the result," Laudrup said.
"We dominated for 75 minutes and we could have won the game. The performance was good."
For Reading, the draw ended a run of seven consecutive defeats.
The Royals are still rooted deep in the relegation zone but they were the only one of the bottom three teams to get any kind of a result on Boxing Day.
Le Fondre saw a late volley headed over the bar by Swansea defender Flores and the Reading striker was also booked for handling the ball Maradona-style into the net.
Newcastle were awarded a handball goal at the Madejski Stadium earlier in the season - but the same luck was not shining on Reading.
A point was a small step, given Reading are still six points from safety.
But stopping the rot was vital for Brian McDermott's men, who had come so close to earning a draw against Manchester City before Christmas.
"We need to find a way to get results and today we got a result," McDermott said.
"We are disappointed they didn't give us the handball goal because they normally give them here. Adam would have headed it but he said he got pulled back.
"We were much more resilient, it is important to move on with a point and we can look forward with confidence to West Ham.
"We have got a point and a clean sheet and we are off the bottom of the table."